Here are my observations and they are worth exactly what you paid for them.
1. Not 100% sure, because the pictures aren't real good, but I think you gun has already been reblued, it does not look like the original finish. If the sides of the hammer are blue then its been reblued they should be bright metal. The sides of the frame should have a brushed blue finish, they were not polished before bluing.
2. The cylinder looks like the shorter 45 acp cylinder with enough space to use half moon clips. What makes you think it is a 45 long colt.
3. the grips are not original
4. The serial number and army number indicate that this was original a 1917 shipped to the army, it is not a later parts clean up gun.